//引入redis
const redis = require('redis')
const REDIS_CONF = require('redis')
const REDIS_CONF = require('../conf/db')
const redisClient = redis.createClient(REDIS_CONF.port, REDIS_CONF.host);

redisClient.on('error', err => {
console.error(err);
})

function set(key, val) {
if (typeof val === 'object') {
    // val必须是一个字符串
    val = JSON.stringify(val)
}
redisClient.set(key, val, redis.print);
}

function get(key) {
const promise = new Promise((resolve, reject) => {
    redisClient.get(key, (err, val) => {
        if (err) {
            reject(err)
            return
        }
        if (val === null) {
            resolve(null)
            return
        }

        try {
            resolve(
                JSON.parse(val)
            )
        } catch (ex) {
            resolve(val)
        }
    })
})
return promise
}